It is healthy to eat sweet potato during pregnancy.
Constipation is very common during pregnancy. Fiber in sweet potatoes can improve digestive system and prevent constipation.
Vitamin B6 which is found in the sweet potato can help to fight morning sickness.
Vitamin A is in general good. However, too much vitamin A in the body has been found to be related to miscarriage, stillbirth, birth defects. It is therefore important for pregnant women to control the daily intake of the sweet potato.